package com.ruoyi.common.utils.file;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.ArrayUtils;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.uuid.IdUtils;
import org.apache.commons.io.FilenameUtils;

/**
 * 文件处理工具类
 * 
 *
 */
public class FileUtils {
  public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";

  /**
   * 输出指定文件的byte数组
   * 
   * @param filePath 文件路径
   * @param os       输出流
   * @return
   */
  public static void writeBytes(String filePath, OutputStream os) throws IOException {
    FileInputStream fis = null;
    try {
      File file = new File(filePath);
      if (!file.exists()) {
        throw new FileNotFoundException(filePath);
      }
      fis = new FileInputStream(file);
      byte[] b = new byte[1024];
      int length;
      while ((length = fis.read(b)) > 0) {
        os.write(b, 0, length);
      }
    } catch (IOException e) {
      throw e;
    } finally {
      IOUtils.close(os);
      IOUtils.close(fis);
    }
  }

  /**
   * 写数据到文件中
   *
   * @param data 数据
   * @return 目标文件
   * @throws IOException IO异常
   */
  public static String writeImportBytes(byte[] data) throws IOException {
    return writeBytes(data, RuoYiConfig.getImportPath());
  }

  /**
   * 写数据到文件中
   *
   * @param data      数据
   * @param uploadDir 目标文件
   * @return 目标文件
   * @throws IOException IO异常
   */
  public static String writeBytes(byte[] data, String uploadDir) throws IOException {
    FileOutputStream fos = null;
    String pathName = "";
    try {
      String extension = getFileExtendName(data);
      pathName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
      File file = FileUploadUtils.getAbsoluteFile(uploadDir, pathName);
      fos = new FileOutputStream(file);
      fos.write(data);
    } finally {
      IOUtils.close(fos);
    }
    return FileUploadUtils.getPathFileName(uploadDir, pathName);
  }

  /**
   * 删除文件
   * 
   * @param filePath 文件
   * @return
   */
  public static boolean deleteFile(String filePath) {
    boolean flag = false;
    File file = new File(filePath);
    // 路径为文件且不为空则进行删除
    if (file.isFile() && file.exists()) {
      flag = file.delete();
    }
    return flag;
  }

  /**
   * 文件名称验证
   * 
   * @param filename 文件名称
   * @return true 正常 false 非法
   */
  public static boolean isValidFilename(String filename) {
    return filename.matches(FILENAME_PATTERN);
  }

  /**
   * 检查文件是否可下载
   * 
   * @param resource 需要下载的文件
   * @return true 正常 false 非法
   */
  public static boolean checkAllowDownload(String resource) {
    // 禁止目录上跳级别
    if (StringUtils.contains(resource, "..")) {
      return false;
    }

    // 检查允许下载的文件规则
    if (ArrayUtils.contains(MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, FileTypeUtils.getFileType(resource))) {
      return true;
    }

    // 不在允许下载的文件规则
    return false;
  }

  /**
   * 下载文件名重新编码
   * 
   * @param request  请求对象
   * @param fileName 文件名
   * @return 编码后的文件名
   */
  public static String setFileDownloadHeader(HttpServletRequest request, String fileName)
      throws UnsupportedEncodingException {
    final String agent = request.getHeader("USER-AGENT");
    String filename = fileName;
    if (agent.contains("MSIE")) {
      // IE浏览器
      filename = URLEncoder.encode(filename, "utf-8");
      filename = filename.replace("+", " ");
    } else if (agent.contains("Firefox")) {
      // 火狐浏览器
      filename = new String(fileName.getBytes(), "ISO8859-1");
    } else if (agent.contains("Chrome")) {
      // google浏览器
      filename = URLEncoder.encode(filename, "utf-8");
    } else {
      // 其它浏览器
      filename = URLEncoder.encode(filename, "utf-8");
    }
    return filename;
  }

  /**
   * 下载文件名重新编码
   *
   * @param response     响应对象
   * @param realFileName 真实文件名
   */
  public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName)
      throws UnsupportedEncodingException {
    String percentEncodedFileName = percentEncode(realFileName);

    StringBuilder contentDispositionValue = new StringBuilder();
    contentDispositionValue.append("attachment; filename=")
        .append(percentEncodedFileName)
        .append(";")
        .append("filename*=")
        .append("utf-8''")
        .append(percentEncodedFileName);

    response.addHeader("Access-Control-Expose-Headers", "Content-Disposition,download-filename");
    response.setHeader("Content-disposition", contentDispositionValue.toString());
    response.setHeader("download-filename", percentEncodedFileName);
  }

  /**
   * 百分号编码工具方法
   *
   * @param s 需要百分号编码的字符串
   * @return 百分号编码后的字符串
   */
  public static String percentEncode(String s) throws UnsupportedEncodingException {
    String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
    return encode.replaceAll("\\+", "%20");
  }

  /**
   * 获取图像后缀
   * 
   * @param photoByte 图像数据
   * @return 后缀名
   */
  public static String getFileExtendName(byte[] photoByte) {
    String strFileExtendName = "jpg";
    if ((photoByte[0] == 71) && (photoByte[1] == 73) && (photoByte[2] == 70) && (photoByte[3] == 56)
        && ((photoByte[4] == 55) || (photoByte[4] == 57)) && (photoByte[5] == 97)) {
      strFileExtendName = "gif";
    } else if ((photoByte[6] == 74) && (photoByte[7] == 70) && (photoByte[8] == 73) && (photoByte[9] == 70)) {
      strFileExtendName = "jpg";
    } else if ((photoByte[0] == 66) && (photoByte[1] == 77)) {
      strFileExtendName = "bmp";
    } else if ((photoByte[1] == 80) && (photoByte[2] == 78) && (photoByte[3] == 71)) {
      strFileExtendName = "png";
    }
    return strFileExtendName;
  }

  /**
   * 获取文件名称 /profile/upload/2022/04/16/ruoyi.png -- ruoyi.png
   * 
   * @param fileName 路径名称
   * @return 没有文件路径的名称
   */
  public static String getName(String fileName) {
    if (fileName == null) {
      return null;
    }
    int lastUnixPos = fileName.lastIndexOf('/');
    int lastWindowsPos = fileName.lastIndexOf('\\');
    int index = Math.max(lastUnixPos, lastWindowsPos);
    return fileName.substring(index + 1);
  }

  /**
   * 获取不带后缀文件名称 /profile/upload/2022/04/16/ruoyi.png -- ruoyi
   * 
   * @param fileName 路径名称
   * @return 没有文件路径和后缀的名称
   */
  public static String getNameNotSuffix(String fileName) {
    if (fileName == null) {
      return null;
    }
    String baseName = FilenameUtils.getBaseName(fileName);
    return baseName;
  }
}
